Figure 1: (Color online) Variations of coercivity with temperature in the temperature range 300 K and 800 K for the FePt films prepared on thermally oxidized Si substrates at ambient temperature and postannealed at different temperatures. Inset: Typical M-H loops obtained at different temperatures between 300 K and 800 K for FePt(50 nm) film annealed at 450°C.